I've seen several of the Russian reworked lugers with similar verticle gooved black plastic grips. Also, the PO8 on the side plate may just be a reminder of the ammo (9mmP) required for this pistol, for those unfamiliar with it (Russians, etc?). Perhaps, the "JAP." may ring a bell with an expert in Finnish, Latvian, Swedish, etc. type units. TH
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